on our vintage of coach, the floor is 2" thick. over the frame is a piece of 1/2" plywood. then furring strips that are made of two pieces of 1/2" plywood stapled together to the floor in strips. then in between the furring strips are 1" pieces of high density foam sheeting. then on top is another 1/2" piece of plywood. when i rebuilt the floor under my driver and passenger seats, i made it solid plywood under the seat mounts.
it also uses the area between the floor under the passenger seat to act as a air duct to the return air. they just left the foam out to form a channel to the duct in the floor if you have one (i dont).
when you strip the current flooring off, and before you put tile or stone flooring down, you HAVE to have an antifracture membrane on the floor as the base for the mastic for the tile/stone.
with a wood floor, you dont have to have the antifracture membrane.
tom
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